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A couple of my buddies are snowmobilers and last year, they were out riding (Michigan here) when they noticed another buddy had dropped behind somewhere back.
They waited 15mins or so then turned around to see what was up. Heading back down the trail they come across the buddy's snowmobile sitting up-right across the trail and him sitting on a log.
They ask what's up and he says he _thinks_ he crashed but can't really remember.
The face shield on his helmet is cracked in half but otherwise, there isn't a scratch on the snowmobile and the guy is walking around stretching and complaining about being kinda sore but otherwise, seems ok.
Just to be safe, they convince him to go to the emergency room, so they all hop on their sleds and head back to the motel and when they get there, the buddy who had crashed collapses in excruciating pain (he'd been in shock the whole time up till then).
They freak out and load him in their truck and take him to the emergency room, where after a few hours the doctor comes out and tell them their buddy has a broken arm, several broken ribs, a sprained shoulder, a mild concussion and a fucking _broken pelvis_!
They had to load him on a helicopter and fly him to a major hospital in Flint (they were sledding up near Tawas) where he spends the next two weeks getting titanium pins and screws bolted into his pelvis to put it back together, then a month of so in rehab.
He later remembered what happened and said he had been coming around a corner on the trail when the ass-end of his snowmobile hit a buried patch of ice and slid sideways, then suddenly "bit" into the trail, flipping into the air where the sled then smashed him up against a tree.
He's was hobbling around with a walker for a few months but is better now and still plans on heading out snowmobiling this winter.